[dspillett]

> cannot be ever closed source

Cannot be closed source unless the maintainer dual licenses and stops making OS (assuming a single maintainer or group that all agree, or that other contributors have signed a relevant copyright waiver).

(though what has already been released can't be retracted)

[stavros]

> (though what has already been released can't be retracted)

This is the only relevant bit. A license can't force people to do work for free in the future.

[remram]

Not the maintainer, all the copyright holders. If you accept contributions without a CLA, that closes that avenue.

I couldn't find any outside contribution in the repo yet, we'll see how they go.

[dspillett]

Hence all my bits in brackets…